杏南开发区表外储层压力敏感性研究

通过岩心流动等实验，分析了杏南开发区表外储层压力敏感性及对开发效果的影响。结果表明，渗透率损失主要发生在净围压增大的初期阶段，净围压达到35MPa时，渗透率损失为25．09％～61．98％，属于弱一中等偏强压力敏感性。净围压减小，岩样渗透率增加，但渗透率不能恢复到原来的状态，压敏所产生的伤害是永久性且不可逆的。因此，在采油时必须适当地控制生产压差，采取注水等措施，避免由于净围压的增大导致渗透率降低，影响开采效果。

Pressure Sensitivity Study on Biaowai Reservoir in Xingnan Development Zone

Through experiments, such as core flow, the effect of the pressure sensitivity of the Biaowai reservoir in Xingnan development zone on the development effectiveness is studied. The results show that the permeability loss mainly occur at the initial stage of increasing the net confining pressure. When the net confining preessure rises to 35MPa, the permeability loss is 25.09%-61.98%, belonging to the medium to strong pressure sensitivity. As the net confining pressure decreases, the permeability of the core will recover but can not recover to the oringinal state, the damange caused by pressure sensitivity is permanent and irreversible. Thus, the production pressure differential must be controlled suitably during oil production, and when the water injection operation is carried, the permeability reduction caused by the increasing of net confining pressure must be avoided, without affecting the development effectiveness.